Largest stack you've faced at your table?

[KidFresh]

At Caesars...this past Sun morning...waiting for my ride home to wake up...I sat down at 2/5...

I couldn't help but notice that a guy sitting across from me had a stack of almost $12K at a $500 max buy-in table. Altho I didn't ask, he seemed pretty alert and didn't appear haggard playing for more than 24 hours straight.

What was the largest stack you've had played against at your 1/2 or 2/5 table?